CookieUtil = {
    createCookie: function(name,value,days) {
	   if (days) {
           var date = new Date();
		   date.setTime(date.getTime()+(days*24*60*60*1000));
		   var expires = "; expires="+date.toGMTString();
       } else{ 
           var expires = "";
       }
   	   document.cookie = name+"="+value+expires+"; path=/";
    },
    readCookie: function(name) {
	   var nameEQ = name + "=";
	   var ca = document.cookie.split(';');
       for(var i=0;i < ca.length;i++) {
	       var c = ca[i];
		   while (c.charAt(0)==' ') c = c.substring(1,c.length);
		   if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
   	   }
	   return null;
    },
    eraseCookie: function(name) {
   	    CookieUtil.createCookie(name,"",-1);
    }
}